<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="jd.css">
    <style>
       .box{
           width: 500px;
           height:500px;
        }
    </style>
</head>
<body>
    <div id="#app">
        <div id="container" class="theme-red">
            <div class="box"></div>
            <div class="box1"></div>
            <div class="box2"></div>
        </div>
    </div>
</body>
</html>